Document dYOkddxZeVdBw5Vk6Eo1k6kRB

Heating Ventilating Air Conditioning Guide 1939 ABBREVIATIONS2 Absolute................................-___---................................ Acceleration, due to gravity____ ................................. Acceleration, linear-________________ -................--....... Air horsepower.......................... ........ ............................... Alternating-current (as adjective)-..... ............. ......... Ampere._________ ____ ~----------- -------------------------------- Ampere-hour....... ....................... -........................ -.......... Area_____;..... ................................................................ -- Atmosphere........ ........ ............. .........-------------------------- Average............. .................-........................ i.................... Avoirdupois:... .......... ........................... v...............-- Barometer.;.................. ....................................................... Boiler pressure-.......-1_____ --.................................-...... Boiling point.__________ ..................... ---;------------------ Brake horsepower..........-........... ......... :-- -------- --... Brake horsepower-hour....... ..................................... British thermal unit.................. -- ................. Calorie_____ --___________ _____ ........................... ......-- Centigram.....--............... .-------------------- ....................... Centimeter___:............................................ ......... ............ Centi meter-gram-second (system) ___ _-................. Change in.specific volume during vaporization:-- Cubic............................................ ..--....... ....................... : Cubic foot________ --.-.--................................... ........ .-- Cubic feet per minute..................... 1-- ........--......... - Cubic feet per second...................... --'-........... .......... -- Decibel :.i-7.1'^....................................... ....................-- Degree*................ ............................................. .................. Degree centigrade............. -............................................ Degree Fahrenheit--....................................................... Degree Kelvin..........--................................ .................... Degree Reaumur:.---.. :_____.......... ------- ....... Density, Weight per unit volume, Specific weight.. _abs ----------- g .....____a __air hp __ --a-c _-.,,amip ..amp-hr ......A ____ atm -------------avg i...... i....avdp .......... ....bar. ........ bp --------- bp _____ --bhp .......,,bhp-hr ...______ Btu .....___,,....cal --------,,^...,,.cg __________l.,cm ........ ---cgs ----- ----I'fg ___ __________cu ________.__ ;.CU ft ____ cfm cfs ...--::.db .deg or ,............. ,,-.F ................... K ....;..R ..d or p (rho) v. Diameter.....------- ;........... .................:-- .......... ~~---.......... or diam Direct-current (as adjective)..............................................-....... --,--------------- r-V----------- .--d-c Distance, linear................................ ......................................--- ------- --------------- --------------------s Dry saturated vapor,' Dry saturated gas at saturation pressure and temperature, Vapor in contact: with;liquid........u-------script:g Entropy (The capital should, fee usedior any weight, and the small letter for unit weight).--..-.-- ......................................................... ................................ S.or s Feet per minute.^--............i...------------ ------ :--fpm Feet per second-..:.:---i--- 1........................1---i.----i...---fps Foot-pound*.-----.................. -.....-------- .ft-Ib Fpptipound-s^ond'Xsystem),.-...........--.-A.--..---^---v.--^-------vr-fps Force, total ioad-'-u--.;-----i-' -A--::.-.----.v-.:'----i--.----......F Freezing point.--i.:---.........fp . Gallons per minute.................................................................................... --............... Gallons per second. --- ............-.............. ...................... -......-^ps Gram^calorie........l.a:^ -jl --............................................... Ig-iCal _________ is. v` . .V'v ..r'4 -"s^From cdmpilatibnsrdfabbreviations approved by the American Standards Association, Z,10 a; c, f, and i/ As a general rule, the period .is? omitted in all.abbreviations except wbpre :;the omission results .in. the formation of an-English'word; rj':.'`V'* J' /'--. V is recommended that the abbreviation for the-tehiperature scale.- F, 'C; K; be included in expressions for numerical temperatures but, wherever feasible, the abbreviation for degree bejomitted^as 68 F. j ^ Chapter 45. Terminology Head- ..H or h Heat content, Total heat,. Enthalpy. (The capital should be used for any weight and the small letter for unit weight). ..H or h Heat content of saturated liquid, Total heat of saturated liquid, Enthalpy of saturated liquid, sometimes called heat of the liquid- -Af Heat content of dry saturated vapor, Total heat of xiry saturated vapor, Enthalpy of dry saturated vapor. Heat of vaporization at constant pressure.__ ,^g ___ L or Afg Horsepower--...............................:-------------- ------- ------------ hp Horsepower-hour.--_...----.--:--------------. __ Jipdir Inch.. Inch-pound__________________________ ____________------------------------------------------------ in.-lb Indicated horsepower._____________________________ ______ _____________________ ___ '..... ihp Indicated horsepower-hour._____________ _______________________________________ ihp-hr Internal energy. Intrinsic energy. (The capital should be used for any weight and the small letter for unit weight)---__________________________________________ U or u Kilowatt'-i-;..-..----------------i___ --~------------------- -----------------_i_.______ _____ __ _____kw Kilowatthoiir--:........................... --------------............. - --......... --____.:....................kwhr Length of path of heat flow, thickness................... ......................... ,................. ........ ......... ,,_,,_L Load, totaL^IS.________ _____ --_________ -________ ______________ .,,,,,,______________ _W Mass._____ ___ ____________ __ ---- .' -- ......................... 1.1,,.,, _______________________ m Mechanical efficiency:...................................................... ...... .......... ........ ....................... ................em Mechanical equivalent of heat:___________ :.....:.......... ....................................................... ..........7 Melting point____________________________ mp Meter r .............................................................................................-..........................................m Micron._.................... (mu) Miles per.hour.__________ _________ ________________ _________________ -_______________mph Minute...... .............. min Molecular weight---________________________ ____ ___..................:_______________ __ mol. wt Ounce_____ _______________________________________ oz Power, Horsepower, Work per unit time.:----^ _____:; ............................ ;....... JP Pressure, Absolute pressure,. Gage pressure, Force per unit area______________ ________ p Quantity (total) of fluid, water, gas, heat; Quantity by volume; Total quantity of heat transferred........... ~ Quality of steam. Pounds of dry steam per pound of mixture....................................... Revolutions per minute______ __________________ ___________ ___________ -..... ........ ........ -rpm Saturated liquid at saturation pressure and temperature, Liquid in contact with vapor-........................ ............................................................. ....... .................Subscript f Specific gravity............. ,___________ ___________ ....._______ ..._____________ sp gr Specific, heat--*...... ..................................................................... ........ sp ht or c Specific heat at constant pressure..^____ __ ___________________________ __ ________.cp Specific heat at constant volume____ __________ ___ ......____________ cv Specific volume, Volume per unit weight, Volume per unit mass.- ____--.r Square foot..____ ..........._______ __________ ____________ ______________ __ .....sq ft Square inch......................... .......... ...................... ........... ....... ..................-..... --_____sq in. Temperature (ordinary). F or C. (Theta is used preferably only when t is used for, .Time in the same discussion)--.-.._____________ _____________ ___ J.____ i or 0 (theta) Temperature (absolute) F abs or K. (Capital theta is used preferably only when small theta is used for ordinary temperature)._________________ T or (capital theta) Thermal conductance4 (heat transferred per unit time per degree),__ ;__________________C kA c = 1r = L h -h Thermal conductance per unit area,-Unit conductance (heat transferred per unit time per unit area per degree) .....______ _____ ______ :__________________ _ ...Ca __C 1 :q v . a-. A , KA A(t, -/,) k L Terms ending ivity designate'properties independent of size or shape, sometimes caW^Aspecific proper ties. Examples are--vonductivHy and resistivity. Terms ending ancc designate quantities depending not ontyvoq .the. material. hut:also upon size and shape, sometimes called total quantities.. Examples are-- conductance and transmittance. Terms ending ion designate rate of'heat transfer. 'Examples are--con duction and transmission. 847